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G8MNY > TECH 21.02.25 17:28l 72 Lines 3196 Bytes #8 (0) @ WW
BID : 26491_GB7CIP
Read: GUEST
Subj: 4m 5/8 Vertical
Path: JH4XSY<JE7YGF<LU4ECL<VK2RZ<GB7CIP
Sent: 250221/0819Z @:GB7CIP.#32.GBR.EURO #:26491 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To : TECH@WW
From: ANDY G6OHM@GB7HOL.#22.GBR.EU (new Nov 04)
FIVE-EIGHTHS VERTICAL FOR 4M
============================
THE ANTENNA IS BASED ON A DESIGN FROM THE ARRL HANDBOOK.
THE ANTENNA IS MADE FROM AN OLD CB ANTENNA.
THIS ARTICLE WAS TAKEN FROM THE 4M NEWSLETTER WRITTEN BY G7RSD.
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^ || B|____|
LENGTH TO TOP || |//| 7 TURNS 16 SWG
OF COIL > || |//| COPPER WIRE ON 22MM
2680MM || |//| < DIA GRP TUBING.
|| |//| 10 MM BETWEEN TURNS,
|| |//| APROX.
|| |//| LENGTH OF GRP TUBE
|| |//| 130 MM.
|| |//| COILS SELF TAPPED ONTO
| | |//| ALLI TUBING EACH END.
| | _____B|//|
| | I |----|< RUN COPPER WIRE TO
| | I | | UHF SOCKET.SELF TAP
| | MMM***| | BRACKET TO ALI TUBE
| | MMM *| |
|__| | |
||
|| < COIL
||
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|| CIRCULAR GROUND PLANE 270 MM DIA.6mm ROD.
I---|| GROUND PLANE MADE IN A SPIRAL .THE FREE END
//////I////////////// IS JOINED BY A SHORTING BAR TO THE BOTTOM
I |--|B/////// ROD JUST PASSED WHERE THE ROD COMES OUT
MMM**| | OFF THE BOTTOM ALI SECTION.THE BOTTOM ALI
MMM *| | SECTION LENGTH IS 400MM.
*| | YOU WILL NEED AN ADJUSTMENT AT THE FREE END
///-----| | OF THE GROUND PLANE TO HELP VSWR.
///-----| |
/// | |
/// | |
/// | | < 400 MM 270 MM DIA CIRCLE
///_____| | ...................
///_____|__| . .
/// . .
/// . 00 .
/// . I .
/// . I .
/// . IIIIIIIII.
.............//...
^
// INDICATE SHORTING BAR &
EXTRA PIECE FOR ADJUSTMENT
LENGTH OF ROD TO MAKE CIRCULAR GROUND PLANE IS 1070MM
73 - ANDY, G6OHM @ GB7HOL
Why Don't U send an interesting bul?
73 De John G8MNY @ GB7CIP
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